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Relevant Information:

Dorsal soft rays (total): 5 - 6; Anal
soft rays: 21 - 26; Vertebrae: 37 - 41. The combination of the
presence of a dorsal fin with an ossified spinelet and the presence
of pectoral and dorsal-fin spines distinguishes the species of
Cetopsidium from all other genera in the Cetopsinae.
The possession of a lateral line extending to over the posterior
portion of the base of the anal fin but falling short of the caudal
peduncle is also unique to Cetopsidium within the Cetopsinae.
Sexual dimorphism. Presumed mature males of Cetopsidium
pemon have the first ray of the dorsal and pectoral fins
extending past the fin margin as a distinct filament contrary
to the absence of such a prolongation on these rays in females
and immature males. Mature males of the species also have the
anal-fin margin broadly convex rather than straight as in females
and immature males.